Ensure Cocoa sets up its multithreaded environment

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@1476 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/base/condition_variable_unittest.cc b/base/condition_variable_unittest.cc
index 3632f11a8..c89624a 100644
--- a/base/condition_variable_unittest.cc
+++ b/base/condition_variable_unittest.cc
@@ -10,6 +10,7 @@
 
 #include "base/condition_variable.h"
 #include "base/logging.h"
+#include "base/platform_test.h"
 #include "base/platform_thread.h"
 #include "base/scoped_ptr.h"
 #include "base/spin_wait.h"
@@ -20,7 +21,7 @@
 // Define our test class, with several common variables.
 //------------------------------------------------------------------------------
 
-class ConditionVariableTest : public testing::Test {
+class ConditionVariableTest : public PlatformTest {
  public:
   const TimeDelta kZeroMs;
   const TimeDelta kTenMs;